Good morning, I am a new user of rawtherapee under fedora 25, version 4.2.1234. I did several tests but I can not find the color labels and the notations (rating) in the jpg files during an output processing. The file corresponds to the processing, and the other metadata is present. Is there an option to check that I would not have seen? Thank you.

When I assign a color label and a star then I export in jpg my raw file, labels and stars are not assigned to the jpg file. I use xnviewmp to view it and yes it was in the exif data. Hope to have been clearer. And thank you for looking into my problem.

I am so sorry, but do you mean checkbox Image Processing / Copy Exif/IPTC/XMP unchanged to output file?Because it does not help due to non changed raw file I think. The rating is in PP3 file, but not in exif. It probably help if I rate originial RAW in some other program, not in RT.My use case:Open RAW in RT, change in editor, rate 1-5 star, add to queue and export. But unfortunately in exif of exported jpeg is not rating...Thanks for answer

but despite the tags existing the values they contain follow no standard I'm aware of.

Let's try something. Here are three photos, I set the Exif rating tags manually using ExifTool: one uses the Rating tag, the other uses the RatingPercent tag, the third is without these tags straight out of RT. Does your "other software" show the ratings at all? https://filebin.net/0ly7t8s8oci31kqj

The 5-star rating system seems to be a de facto standard, though how its implemented under the surface probably varies. It seems that:

Exif is generally not used for ratings,

IPTC might be, but it has been superseded by XMP so no point wasting time on obsolete technology,

XMP is used for rating.

The XMP spec has this to say about xmp:Rating:

XMP specification part 1:

A user-assigned rating for this file. The value shall be -1 or in the range [0..5], where -1 indicates “rejected” and 0 indicates “unrated”. If xmp:Rating is not present, a value of 0 should be assumed. NOTE Anticipated usage is for a typical “star rating” UI, with the addition of a notion of rejection.